Cutting blade



FIG. 1 is a perspective view of a cutting blade showing our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left end view thereof;

FIG. 6 is a right end view thereof. 

The ornamental design for a cutting blade, substantially as shown and described. 